CVE-2026-57585

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Source
https://cve.org/CVERecord?id=CVE-2026-57585
Import Source
https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-57585.json
JSON Data
https://api.osv.dev/v1/vulns/CVE-2026-57585
Aliases
Downstream
Related
Published
2026-06-30T21:36:23.418Z
Modified
2026-07-09T18:29:35.316687348Z
Severity
  • 7.5 (High) CVSS_V3 - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H CVSS Calculator
Summary
MessagePack: Out-of-bounds read/crash on Unpacker reuse after caught error
Details

MessagePack is the serializer implementation for Python msgpack.org. Prior to 1.2.1, there is an Out-of-bounds read/crash on Unpacker reuse after a caught error, potentially leading to a DoS attack. If the Unpacker is used repeatedly after an error occurs, the process may crash with a SEGV. This issue has been fixed in version 1.2.1.

Database specific 
{
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/57xxx/CVE-2026-57585.json",
    "cwe_ids": [
        "CWE-416"
    ],
    "cna_assigner": "GitHub_M"
}
References

Affected packages

Git / github.com/msgpack/msgpack-python

Affected ranges

Type
GIT
Repo
https://github.com/msgpack/msgpack-python
Events
Introduced
0 Unknown introduced commit / All previous commits are affected
Fixed
2c56ddb5d0025ed481d962c0f5d62d19dec7476d
Database specific 
{
    "source": [
        "AFFECTED_FIELD",
        "REFERENCES"
    ],
    "extracted_events": [
        {
            "introduced": "0"
        },
        {
            "fixed": "1.2.1"
        }
    ]
}

Affected versions

0.*
0.1.10
0.1.11
0.1.12
0.1.13
0.2.0
0.2.1
0.2.2
0.3.0
0.4.0
0.4.1
0.4.2
0.4.3
0.4.4
0.4.6
0.4.7
0.5.0
0.5.1
0.5.2
0.5.4
0.5.5
0.5.6
v0.*
v0.6.0
v0.6.1
v0.6.2
v1.*
v1.0.0
v1.0.0rc1
v1.0.1
v1.0.2
v1.0.3
v1.0.3rc1
v1.0.4
v1.0.4rc1
v1.0.5
v1.0.5rc1
v1.0.6
v1.0.6rc1
v1.0.7
v1.0.8
v1.1.0
v1.1.0rc1
v1.1.0rc2
v1.1.1
v1.1.1rc1
v1.1.2
v1.2.0
v1.2.0rc1

Database specific

source 
"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-57585.json"